Completely different.

Intermittent fasting has some solid research behind it. (Wikipedia, but medical journal citations in the notes.) Besides centuries of tradition and the simple fact that wild terrestrial animals are rarely able to eat every single day, meaning we evolved for intermittent fasting.

Chemical purges strip the intestinal flora, which are an important part of the immune system. The microbiota aren't stripped at all by fasting, and even low enemas don't affect the population all that much.

You weren't detoxified in any way, shape or form ... you actually introduced chemicals into your system to induce the diarrhea. Not strange at all that you wouldn't feel well for some time afterwards while your gut reestablishes its ecosystem.

Some probiotics and - yes - healthy alkalizing foods like raw juices will probably get you back to normal more quickly than anything.